Quite a lot of change (new function user_is_member_of_role() in 49676 looks particularly interesting), but also 49676 has introduced quite a bit of new stuff which 49780 has removed (including that new function).
https://www.redshiftresearchproject.org/system_table_tracker/1.0.49087_to_1.0.49676/index.html
https://www.redshiftresearchproject.org/system_table_tracker/1.0.49676_to_1.0.49780/index.html